Rocky (1 of 2) (IMAGE) Smithsonian Caption The Smithsonian's National Zoo has a new addition: Rocky, a male whooping crane (Grus americana). This is the first time the Zoo has exhibited this species in 88 years. Visitors can see Rocky on exhibit at the Zoo’s Bird House and learn about this endangered species, which were reduced to only an estimated 21 individuals in 1938 due to hunting and agricultural expansion. Their population, however, is now on the rise and scientists at the Smithsonian Conservation Biology Institute will also be looking to Rocky to help them determine the impact of genetic diversity on whooping crane sperm quality and fertility rate in captivity. Credit Mehgan Murphy Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.